Oven under microwave: the order form for a combo tower
Reviewed September 2026 · Captivating Cabinets
The combo tower — GN OC3384C, OC3390C, OC3393C and OC3396C, $1,677.00 to $1,836.25 — is the most frequently mis-ordered tall box we sell, and the reason is structural rather than careless. Every other cabinet in the kitchen is specified against one thing: a wall, a sink, a dishwasher, a single oven. This one is specified against two appliances of different heights whose combined stack has to land inside one factory-cut face. Get either appliance wrong and the cabinet is wrong, even though only one of them changed. So this page is not an argument. It is a form, and nothing should go on the quote until every line of it is filled in.
Two openings, two appliances, one face
What you are buying is a tower with a wall oven low and a microwave or speed oven above it, with the remaining space finished as a door or a drawer. Three fixed relationships make it unforgiving. The lower cutout is dimensioned for the oven. The upper cutout is dimensioned for the microwave and its trim kit. And the distance between them is set at the factory, so the two appliances cannot be moved apart or brought together to take up a discrepancy.
That is why changing one appliance changes the cabinet. A buyer picks the oven, sends the sheet, gets the box confirmed — and then swaps the microwave for a different model three weeks later because it was on offer. The new microwave has a different cutout height and a different trim kit, and the tower that was right is now wrong at the top. Nothing about the oven changed and nothing about the order is recoverable.
The corollary is the one genuinely good piece of news on this page: if both appliances are pinned down on the same day, from the same two documents, this box is no harder to order than a pantry. The difficulty is entirely in the sequencing.
The eight lines, and where each number comes from

Fill this in before anything is quoted. Blank lines are not delays; they are the cheapest part of the project.
| Line | Where it comes from | Why it is on the form |
|---|---|---|
| 1. Oven make, model and year | The appliance itself, or the receipt | Cutouts change between model years of the same series |
| 2. Oven cutout: width, height, depth | The oven installation sheet | Decides the lower opening and whether the box can be used at all |
| 3. Microwave or speed oven make and model | The second appliance | The upper opening is cut for one specific unit |
| 4. Microwave cutout, with the trim kit part number | The microwave sheet — trim kits are usually a separate SKU | A built-in microwave without its trim kit does not finish against the frame |
| 5. Combined stack height | Both sheets added, including any required gap between them | This is the figure the cabinet face has to accommodate |
| 6. Electrical requirement for each appliance | Both sheets, plus your electrician | Two appliances can mean two circuits and two rough-in positions |
| 7. Ventilation and clearance requirements | Both sheets | Speed ovens and some microwaves need free air the cabinet cannot invent |
| 8. Cabinet height, 84 / 90 / 93 / 96 | Your ceiling, measured in four corners | GN OC3384C $1,677.00, OC3390C $1,755.00, OC3393C $1,758.25, OC3396C $1,836.25 |
Line four is where most of the trouble is. A built-in microwave is finished by a trim kit that is ordered separately, sized to the cabinet opening, and specific to the model — and it is the trim kit, not the microwave, that closes the joint against the cabinet face. If nobody has a trim kit part number, the appliance package is not specified yet.
Send the completed form and both sheets to us, or through the free 3D design service, and we will check every line against the published opening for the SKU before the order goes anywhere. That review is free and it is the reason this page exists.
The microwave has to be a built-in, and the reason is not snobbery
A countertop microwave pushed into a cabinet opening is the other half of the mis-order problem, and it is worth being blunt about. A countertop unit is designed to sit in open air on a surface: it vents around its own case, it has a cord and a plug expecting a receptacle in front of it, and it has no flange to close against a cabinet face. Put it in a hole and three things happen — it runs hot because the air it needs is not there, the cord is trapped behind it, and the opening around it stays visibly an opening.
A built-in unit, or a countertop model that the manufacturer explicitly publishes a trim kit for, solves all three: the kit provides the vent path the appliance was tested with and the flange that finishes the joint. The distinction is made by the manufacturer, not by us and not by the cabinet. If the sheet does not name a trim kit for that model in that opening size, it is not a cabinet microwave.
One related exclusion: an over-the-range microwave is not a candidate for this tower either. Those are built to hang under a cabinet above a cooktop and to vent up or out through the wall behind them. If the plan needs extraction over the cooking surface, that is a range hood and it is a separate line on the quote.
The space that is left over
Two appliances of different heights rarely fill a tower exactly, which is what gives the combo box its third element: a finished door or drawer taking up the remainder. It is the most useful storage on the oven wall, because it is the only storage on the oven wall, and it is a few feet from where hot things land.
The listings do not publish which configuration each SKU carries or how the remainder is divided, and the arrangement can differ between heights. Ask before you plan around it rather than assuming, because the difference between a deep drawer and a hinged door here changes what the space is good for.
- Oven racks and the broiler pan, stored on edge, where they belong and nowhere else fits them.
- Sheet pans, cooling racks and pizza stones, standing rather than stacked.
- The microwave turntable plate, which otherwise lives in a base cabinet across the room.
- Trivets and oven gloves, at the height you actually need them — beside the door that is about to open.
- What does not belong here: anything heat-sensitive, and anything you need while the oven door is down and blocking the front of the tower.
Finishing the tower where it meets the room
Thirty-three inches is an appliance dimension rather than a cabinet-run dimension, so a combo tower almost always needs something either side of it to reconcile with the rest of the wall. A tall filler does that: GN TF396 at $84.50 for three inches by ninety-six, GN TF696 at $152.75 for six, on the filler page. An exposed side takes GN SK TALL at $169.00, and a run that wants dividing from the pantry next to it can take a tall pilaster, GN PP-TP96 at $464.75.
Buy those pieces in the finish rather than painting them on site. Two stainless fronts stacked in a grey tower put a bright edge against painted trim at eye level in the best-lit part of the room, and a paint match that would pass anywhere else on the wall will not pass there.
After that it is the ordinary tall-cabinet discipline: ceiling in four corners, delivery route walked, appliances on site before the installer is, and both circuits in the wall before the drywall closes. Lead time is 7 days to 3 weeks, pre-assembled, with the doors hung and the hinges set. Trade buyers order through Captivating Pro; every other tall box in the finish is on the tall cabinet page.
Common questions
- What is a combo oven cabinet?
- A tall tower cut for two appliances of different heights — typically a wall oven with a microwave or speed oven above it — with the space left over finished as a door or drawer. It is the middle option in price between a double-oven and a single-oven tower.
- Can I put a countertop microwave in a combo oven cabinet?
- No. A countertop unit vents around its own case and has no flange to close against the cabinet face, so it runs hot and the opening stays visibly unfinished. Use a built-in, or a model the manufacturer publishes a trim kit for.
- Do I need to choose the microwave before ordering the cabinet?
- Yes, at the same time as the oven. The upper cutout is sized for one specific unit and its trim kit, and the distance between the two openings is fixed at the factory. Changing the microwave after the order invalidates the box even though the oven has not changed.
- How much is a combo oven cabinet?
- $1,677.00 at 84 inches, $1,755.00 at 90, $1,758.25 at 93 and $1,836.25 at 96. All four are 33 inches wide and full depth.
- Does a microwave trim kit come with the microwave?
- Usually not — it is normally a separate part number sized to the cabinet opening and specific to the model. If nobody on the project has that part number, the appliance package is not specified yet.
- Can an over-the-range microwave go in an oven tower?
- No. Those are built to hang under a cabinet above a cooktop and to vent up or through the wall behind them. If you need extraction over the cooking surface, that is a range hood and a separate line on the quote.
Keep reading
The guides behind the numbers on this page.
- Fabuwood Cabinet Sizes and Specs
The published openings every line of the form is checked against.
- Kitchen Cabinet Terminology: Glossary of Terms, Parts and Abbreviations
Trim kit, cutout, rough-in and reveal, in the language the sheets use.
- Important Kitchen Dimensions Before Buying Cabinets
The landing counter and clearances two stacked appliances need.
- How to Read Cabinet SKU Codes
The C at the end of OC3396C, and what it commits you to.
- Cabinet End Panels, Scribe Molding and Fillers Explained
Reconciling a 33-inch appliance width with a wall that is not a multiple of it.
- Free 3D Kitchen Design
Send both sheets and get the tower drawn before anything is cut.
- 27 Kitchen Cabinet Ideas
Where an appliance tower sits in a finished room, for reference.
- Fabuwood Cabinets Review
The construction behind a box that carries two appliances.







